Cosmo COS-RIS365SS vs. COS-RES365SS: Is the Induction Version Worth It?

Buy the Cosmo COS-RIS365SS if you want induction’s speed and control, a griddle-ready sync bridge, and a cooktop that stays cooler, and you already own (or will buy) magnetic cookware. Buy the COS-RES365SS if you want the same oven and footprint for less money, or you cook with aluminum or copper pans. The two are near-identical 36-inch Stellar Collection slide-in ranges: same 6.1 cubic foot convection oven, same oven modes, same dimensions, same electrical circuit. The only real difference is the cooktop, and the price gap that comes with it.

Cosmo announced the induction model on Oct. 7, 2026, and says it’s sold at Home Depot, Lowe’s, and Wayfair at a list price of $4,266.99. The radiant COS-RES365SS is the existing model it’s built alongside.

This is a research-based comparison built from Cosmo’s spec sheets, user manuals, installation instructions, and warranty. We have not tested either range, so there are no ratings or verdicts here.

Side-by-side: COS-RIS365SS vs. COS-RES365SS

Specs come from Cosmo’s spec sheets and manuals (checked Oct. 13, 2026).

	COS-RIS365SS (induction)	COS-RES365SS (radiant)
Cooktop	5 induction zones, black ceramic glass	5 radiant elements, black ceramic glass
Center element	2,500 W (3,700 W boost)	3,000 W dual element
Front left / front right	1,600 W each (2,100 W boost)	2,100 W / 1,800 W
Rear left / rear right	1,200 W each (1,500 W boost)	1,200 W each
Bridge	Left sync, 3,600 W	None
Oven capacity	6.1 cu ft, convection	6.1 cu ft, convection
Oven modes	Bake, convection bake, broil, air fry, delay start, keep warm	Same
Bake / broil elements	3,500 W / 3,500 W	3,500 W / 3,500 W
Racks	2 racks, 6 positions; air fry tray	2 racks, 6 positions; air fry tray
Oven cleaning	Steam clean	Steam clean
Controls	Metal knobs, digital oven display	Metal knobs, digital oven display
Dimensions (W x D x H)	35.9 x 27.8 x 36.2 in	35.9 x 27.8 x 36.2 in
Installation	Slide-in	Slide-in
Circuit (per install guide)	Dedicated 40 A minimum, 240 V or 208 V	Dedicated 40 A minimum, 240 V or 208 V
Warranty	1-year limited	1-year limited

Cosmo’s release also says the induction model’s bake element is hidden beneath the enamel oven floor. The COS-RES365SS documents we checked don’t say either way.

What does induction add on this range?

Power Boost on every zone

Each induction zone has a Power Boost setting (“P” on the display). The 11-inch center zone jumps from 2,500 to 3,700 watts, the front pair from 1,600 to 2,100 watts, and the rear pair from 1,200 to 1,500 watts. Cosmo’s manual says boost runs for up to 10 minutes, then the zone drops back to Hi. That’s the setting you’d use to bring a big pot of pasta water to a boil.

A sync bridge for griddles

The two left zones can be linked into a 3,600-watt bridge for a long griddle or oval roaster. You hold both left knobs at “P” for three seconds to sync them, then control the pair from the front-left knob. Boost isn’t available while the zones are synced.

A cooler, easier-to-clean cooktop

Cosmo’s manual says induction elements stay cooler than radiant elements because the heat starts in the pan, so spills are less likely to burn on. The glass still gets hot from the cookware: the “H” indicator comes on at about 131°F (55°C) and stays on until the surface cools to about 113°F (45°C).

Pan detection

The zones won’t heat without a suitable pan. If a zone is on with no pan or the wrong pan, the display shows “U,” and the zone shuts itself off after 30 seconds. Pan size matters too: Cosmo lists a 9.5- to 11.8-inch pan bottom for the center zone and 6.5 to 8.1 inches for the four smaller zones.

For the broader trade-offs, including efficiency figures from ENERGY STAR and the Department of Energy, see our gas vs. electric vs. induction range guide.

What does the radiant model do better?

• Works with more cookware. Any flat-bottomed pan that sits flat on the glass works. Cosmo notes that aluminum and copper conduct heat well but can leave marks on the glass if you slide them. It says glass-ceramic and stoneware cookware perform poorly and can scratch the cooktop.
• A flexible dual element. The 3,000-watt center element runs as a smaller single ring (turn the knob counterclockwise) or the full dual ring (clockwise), so it fits both small saucepans and large pots.
• Lower price. The cooktop is the only thing you give up, and you keep the same oven.

Do I need new pans for the induction range?

Only if your pans aren’t magnetic. Cosmo’s manual says the base of the pan must be magnetic for the elements to turn on: if a magnet sticks firmly to the bottom, the pan will work. Cast iron and most magnetic stainless steel are good choices. Not all stainless steel is magnetic, so test each pan instead of assuming.

Cosmo also notes that some pans buzz on induction, especially when cold, when the bottom isn’t flat, or on Power Boost. Cosmo says a slight buzz is normal.

How much more does the induction model cost?

List prices are far apart: $4,266.99 for the COS-RIS365SS (Cosmo’s release) and $2,666.99 for the COS-RES365SS (as listed at ShopAppliances). Street prices are much closer. As of Oct. 13, 2026, ShopAppliances listed the induction model at $2,799.99 and the radiant model at $2,499.99, a $300 gap at the same retailer. Prices vary a lot between Home Depot, Lowe’s, Wayfair, and other dealers, so compare the exact model numbers before you buy.

If you’d need to replace several non-magnetic pans, add that cost to the induction side.

Installation: what your kitchen needs

Both ranges are 35.9 inches wide, 27.8 inches deep, and 36.2 inches tall, built for slide-in installation, so either fits the same cutout. Cosmo’s installation instructions for both call for:

1. A dedicated, properly grounded branch circuit of at least 40 amps, single-phase 120/240 V or 120/208 V.
2. A UL-listed 40- or 50-amp range cord or conduit connection. Neither range ships with a power cord.
3. An anti-tip bracket attached to the floor or wall and engaged with the range. Cosmo says not to operate the range without it.

If you’re replacing a gas range, you’ll need an electrician to add the 240-volt circuit and a qualified professional to cap the gas line. If you ever smell gas, leave the house and call your gas utility from outside.

Reliability, repairability, and warranty

The COS-RIS365SS went on sale in October 2026, so there’s no long-term reliability data yet. We found no CPSC recall for either model as of Oct. 13, 2026.

Warranty. Cosmo covers both ranges with a one-year limited warranty. For 12 months, Cosmo pays for factory-specified replacement parts and repair labor to fix defects in functional parts, or may replace the range. Cosmetic damage, consumables, and problems caused by improper installation or household wiring aren’t covered. Register the range and keep proof of purchase; Cosmo asks for the model number, serial number, and photos or video when you request service.

Troubleshooting. Both user manuals include an error-code section and a “before calling for service” checklist. Codes differ between the induction and radiant models, so use the manual for the model you own.

Once your range is in, our guide to cleaning your oven before the holidays covers steam-clean cycles like the one on both Cosmo models.

Choose the COS-RIS365SS (induction) if…

• You want faster boiling and quick heat changes, with Power Boost on every zone
• You cook on a griddle and want the left-side sync bridge
• You have kids and like a cooktop that stays cooler around the pan
• Your pans are already magnetic, or you’re ready to replace them

Choose the COS-RES365SS (radiant) if…

• You want the same oven and footprint for less money
• You cook with aluminum or copper pans and don’t want to replace them
• You like a dual element that adapts to pot size
• Someone in your home has a pacemaker or similar implant and prefers to avoid induction

Bottom line

The Cosmo COS-RIS365SS and COS-RES365SS are the same 36-inch slide-in range with two different cooktops. Both have a 6.1 cubic foot convection oven with air fry and steam clean, the same size, the same 40-amp circuit requirement, and a one-year warranty. Induction adds Power Boost, a griddle bridge, pan detection, and a cooler cooktop, and at ShopAppliances on Oct. 13, 2026, it cost $300 more. If your cookware is magnetic, induction is the upgrade worth considering. If not, the radiant model gets you everything else for less.

For more head-to-heads, browse all appliance comparisons or see every range and oven guide.